Process for reforming hydrocarbons with carbon dioxide by the use of a selectively permeable membrane reactor

Active Publication Date: 2006-11-30
NGK INSULATORS LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0010] According to the present invention, inactivation of the catalyst due to coking can be reduced when carrying out the carbon dioxide reforming reaction of the hydrocarbon using the permeable membrane reactor, whereby the reaction can be efficiently and stably carried out over a long time. T

Problems solved by technology

In particular, since coking occurs to a large extent when using the selectively permeable membrane reactor in comparison with the case of using a normal reac

Method used

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  • Process for reforming hydrocarbons with carbon dioxide by the use of a selectively permeable membrane reactor
  • Process for reforming hydrocarbons with carbon dioxide by the use of a selectively permeable membrane reactor
  • Process for reforming hydrocarbons with carbon dioxide by the use of a selectively permeable membrane reactor

Examples

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example 1

[0028] A selectively permeable membrane reactor having a structure as shown in FIG. 1 was produced using a palladium membrane as the selectively permeable membrane (hydrogen permeable membrane) and a catalyst in which platinum was supported on the surface of a zirconia carrier in the shape of pellets. A raw material gas containing methane, carbon dioxide, and steam was supplied to the selectively permeable membrane reactor at a molar ratio of CO2 / CH4=1.0 and H2O / CO2=0.05 to effect a carbon dioxide reforming reaction of methane and a reaction occurring along with the reforming reaction to separate hydrogen from the reaction products. The reaction temperature was 550° C., the reaction-side pressure was 1 atm (101.3 kPa), and the permeation-side pressure was 0.1 atm (10.1 kPa). The flow rate of the raw material gas was adjusted so that the flow rate of methane was 100 ml / min. The conversion rate of methane was measured in the initial stage of the reaction (30 minutes after the reaction...

example 2

[0029] A reaction was carried out in the same manner as in Example 1 except for supplying methane, carbon dioxide, and steam at a molar ratio of CO2 / CH4=1.0 and H2O / CO2=0.1. The conversion rate of methane was measured in the initial stage of the reaction and two days after initiation of the reaction. The results are shown in Table 1.

example 3

[0030] A reaction was carried out in the same manner as in Example 1 except for supplying methane, carbon dioxide, and steam at a molar ratio of CO2 / CH4=1.0 and H2O / CO2=0.3. The conversion rate of methane was measured in the initial stage of the reaction and two days after initiation of the reaction. The results are shown in Table 1.

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Abstract

A process for reforming a hydrocarbon with carbon dioxide using a selectively permeable membrane reactor including a catalyst 1 for accelerating a chemical reaction and a selectively permeable membrane 3 exhibiting selective permeability, wherein a carbon dioxide reforming reaction of the hydrocarbon is accelerated by the catalyst 1 and a specific component among reaction products produced by the reaction is selectively separated by allowing the specific component to pass through the selectively permeable membrane 3, the process including adding steam to a raw material gas containing the hydrocarbon and the carbon dioxide and supplying the mixture to the selectively permeable membrane reactor. According to the present invention, inactivation of the catalyst due to coking can be prevented when carrying out the carbon dioxide reforming reaction of the hydrocarbon using the permeable membrane reactor, whereby the reaction can be efficiently and stably carried out over a long time.

Description

TECHNICAL FIELD [0001] The present invention relates to a process for carrying out a carbon dioxide reforming reaction of a hydrocarbon using a selectively permeable membrane reactor. BACKGROUND ART [0002] A reaction between a hydrocarbon such as methane or propane and steam or carbon dioxide is called a reforming reaction, which has been industrially carried out as means for obtaining a synthesis gas (hydrogen and carbon monoxide) or hydrogen used as fuel for fuel cells. A catalyst containing a noble metal such as nickel, ruthenium, rhodium, or platinum as an active component is generally used for the reforming reaction in order to accelerate the reaction. Since the reforming reaction is an endothermic reaction, a high temperature of 700° C. or more is generally required. [0003] In recent years, a selectively permeable membrane reactor (membrane reactor) which allows reaction and separation to occur at the same time has been used to produce hydrogen or the like through the reformin...

Claims

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Application Information

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IPC IPC(8): C01B3/26B01D53/22B01J19/00B01J19/24C01B3/38C01B3/50
CPCB01D53/22B01J19/0026B01J19/2475B01J2219/00247C01B3/38Y02C20/20C01B2203/0238C01B2203/041C01B2203/047C01B2203/0475C01B3/501Y02P20/52
Inventor TAKAHASHI, AKIRAMORI, NOBUHIKONAKAMURA, TOSHIYUKI
Owner NGK INSULATORS LTD
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